x2 - you are going to have to measure it to get an answer. Even if you knew the original rated capacity, chances are the actual is less, due to the placement of water lines and vents, possible tilted install, etc.
A typical coach of that size and era would have about 25-30 gallon black tank and 30-40 gallon gray. Fresh similar to gray.
Don't assume that "1/2" on your tank gauges is actually the halfway mark - it usually is substantially off, either because of the placement of the sensors or malfunction (shorted sensors). Or both.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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